Last K Numbers Sequence

function solve(n,k){
   let newArr = [1];

   for(let i = 1;i < n;i++){
     let target = i - k;
     let sum = 0;

     for(let j = i - 1;j >= target;j--){
       if(j < 0){
         break;
       }
       sum += newArr[j];
     }
     newArr.push(sum)

   }
   console.log(newArr)
}
solve(6,3); //1,1,2,4,7,13